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Precautions for the operation of high-voltage drop-out fuse

During normal operation, the upper and lower contacts at both ends of the blown fuse are fixed by fuses. After pushing the upper moving contact into the protrusion of the bayonet, the upper static contact made of copper sheet abuts the upper moving contact, so that the blown fuse is firmly stuck on the bayonet. When the short-circuit current flows through the fuse, an arc is generated. The paper tube in the fuse tube will generate a large amount of gas under the action of the arc, and the arc will extinguish when the current crosses zero. As the fuse is blown, the upper and lower movable contacts of the fuse tube lose the fastening force of the fuse. Under the action of the gravity of the fuse tube and the springs of the upper and lower static contacts, the fuse tube descends rapidly, opening the circuit.

Function of high voltage fuse

The main function of a high-voltage fuse is that it can be used with an isolating switch, rather than an automatic MCB, because it has excellent performance. It can also be used with load switches. It also has short circuit protection, overload and isolation circuits. Therefore, it is widely used in transmission and distribution lines and equipment.

Application of high voltage drop fuse

Installed on the primary side of the distribution transformer, it can be used as the internal short-circuit protection of the distribution transformer and the short-circuit protection of the low-voltage line. When the power distribution transformer and low-voltage line are out of power for maintenance, because there are obvious disconnect points, it has the function of isolation switch, which brings a sense of safety to maintenance personnel. In the case of load, it is also convenient to stop the transmission operation, so it is widely used in small-capacity distribution transformers. It is often used as outdoor high-voltage protection electrical appliances, transmission lines, power transformer overload and short-circuit protection; open and close rated load current.

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